Add JSpecify annotations to 10 language package classes #3021

Job	Run time
javadoc	1m 11s
buildAndTest (test -x testWithJava11 -x testWithJava17 -x testWithJava21)	7m 5s
buildAndTest (testWithJava11)	7m 12s
buildAndTest (assemble && ./gradlew check -x test)	2m 0s
buildAndTest (testWithJava21)	7m 4s
buildAndTest (testWithJava17)	7m 5s
	31m 37s

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